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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1689f7490c38245c74028d0ed79813d41d247b26b4224be9d13bfce4c17ed6b2' 
  AND token = 'mlC6Qg4SJxxABEHl/SkzvGjRrMMSVA/bOVeI1oj4OwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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