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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4ec683473efa6a6930cf8fb3a3ed79dddab0a84d338e2f3d2d65a78276f0b6' 
  AND token = '3nkrc4Uvgmi4jtXSvENTOGvjq/DdlTIjHpy9V6R18xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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