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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa42f5b3351b81699b56e6a4b50d51426946a90436e7ed0d9496065b2f6fb58' 
  AND token = 'hS13LtgZ0PQdcNbP5ldj2EY4k6M0CSLumarSC4E8Jx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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