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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4229fb2f3ed60073e0b347958068345daf9b65fa891d8150ac4fa88037b2f68e' 
  AND token = 'Qxk2iR+Ih2uJk15a7no4DsvQSbZFKe24TEBaxwLtT4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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