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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092569119a103e99137b00dff1c5f41e0c9ce6aafc7d8b98ba56e84e11606a62' 
  AND token = 'aPnjciPGGqPmCtpagc3E01mOyASQ6J7VrPEEXRbbtjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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