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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08c6eb6e497e46008cb683a3bccfea5b08480ddca19df5248cab07537158ab5' 
  AND token = '4T6FhDj2ePBSO8ZMysPAfh4ybj7MqJ5syPGrqSDNz6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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