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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a445fdb5d341edd2eef63bac50e2b99873526f57c6c3a1ce621f5f9769bee5' 
  AND token = 'Cvc8p0TxMY/y71AqGGyU1tGgbR/KnacbSpYdJ3WpKH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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