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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd712ac50808e0c8af799fbbaab01527b456d85da4c0a6e179753b6451a2675f7' 
  AND token = 'wws4L5Kt/k+91f09k7EhyAu1hwoKyKNaha34TyauPlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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