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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c068606e572f8b83ff8e6a1c5134d600da7bb6590e3fbeed3b8efe173074f7fd' 
  AND token = 'edkX1j2RyKEDjary5ztes/GLYQ7ydG4rW/itet+fFoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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