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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5febcd90e95fb1ddab61629e9f5db6635966aac4713df3102044a437dc90de6' 
  AND token = '0EqEBCEuDHJYmIumSRuMFLIQctdu5vKBQwVgST+xC5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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