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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee14b58f5bb596b4b2965f2dd7640bf5ed24c896da85f38cdd6a8ab62809ebf1' 
  AND token = 'dxwgsdgdyfAege/7LLPi+Zuc+yjtG5syBagokufaY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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