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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc1cb579a7b0a05219a25e90dcf5458ad841f8e153757a23fcc7b037b3ae570' 
  AND token = 'F25cWWu2D4HVonGsa/ic/zXS51gpHgXA88xy1W9oo9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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