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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bc364cf081706db1403a3be1a62fd0320a494ee87c73a5d3cf51fdcfb8226d' 
  AND token = '2l6uXIoxCSsEVciphUWfW3L2minXmb17sS9fiTqGNu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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