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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bacc2eeab98784fca567a9942580ddee50066b721f3529817408d3c2b0563c5' 
  AND token = 'HoCBi+XQD2skfSSrzK9UZHvyURBxI50fx9bSPY7wNsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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