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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de2f873477665357991e06640d290903476017239fbf6b0bcc83a54e736026c' 
  AND token = '3c/55E5UUzIU3SPwKfvD+H7fgpRc+zl0L/VNsWU/4d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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