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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0831e347d267e855917a4c34fafbdf4b5ea95ef3cfe653b24c9abe860a9c40b5' 
  AND token = 'aYerogaq+mIRAdo2NGjWIV7n+Ah4z8yWsn1w7Ul7kes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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