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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367b89e0ca4962d94b6b4d62d77fb083a02b1ef9a9a3fe302bec4cfa104ff0a1' 
  AND token = 'XlIPpqLKc1AiwaEvyhML5L2wdGqid5Isu+wKf6pdniU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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