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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7488469c45bc19073837889cf50c82448e6a724c6ce2234b451280e176456cea' 
  AND token = 'vfPle/VgFFdnQX3SijkMo+ylkoOkarEnLP4iSG9idZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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