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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0f009124372957c21912446aab0ec74f14f47d458b99c79e4815e40cb9aaed' 
  AND token = 'aAzU9/KDBpiOQ5X8YIEKt9EcRcoL9nZZ7mdc+YcvNwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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