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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0af66999fc69f7337a062447f4df643cf0df2e6eac7b54c9e685ed7e346ad113' 
  AND token = 'iChpTZ/rZSjzAunShK350fOANxVjpMHzlLi0EyxWphc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}