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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550156581e5ec59fc7b011b02c018969ebdeab94750425f8499119c06f08b07e' 
  AND token = 'qstWGhAZX7eEV8DUitoLgN7n/mV6+ZHwqow9dDWbGhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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