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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c634e6b632aebf3ec52a1b5b7980123bf63d8ce66d9157cf519c64f13be2ae8' 
  AND token = 'cahAFHvD9VTqrCMKopNT8hOMbS6lC1U5mza6/uXpxPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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