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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0594223adc5cb2f02a502814162177e65142b5e1bc21ff184d42bc11f52015e' 
  AND token = 'fwaG7XUKmfMOYYi9eZz1dKzYlvEhP92b9JK1PnoT2iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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