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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e424a349b0e4adffa87b47cc61f63297c8eeacb245ca14faee8c192c9f819a7' 
  AND token = 'vGpk8+OHEpL/UPZzGiUrM9Prh1+Z6Khm+vMRyRTA43E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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