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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16477edca9ac31b3d1340039e02227cf2a41630e6e1be19912f54b1d55f79dc1' 
  AND token = 'Upu14UPdOIBIfFoaHIf6Xa6VxSDpbV2d/0pOZnNZ6cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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