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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6979b7d979de1c7217ec83e1ee21eb90c4913a325b4ed0b9931f4f0d23ea52c' 
  AND token = 'VfUyLCALCquJbfhojQ0nQvq2aSFleRhZIhziIWFclIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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