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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0e1996d0935e5d49a90afe7239503480b6bd31f27b1fcd4c772b6ab35b0ad0' 
  AND token = '76d/w8LI51famtHyteD59Vu0TWXR+I8cTvhppExepX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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