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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9e677a0eacd35c47ac90eefd06a8eeb9f62eb3d3ce41bf74aabc2f5d0ae47c' 
  AND token = 'N7m/IubV2JV3qqH98nsCp6TjdbP0myzZLcaOrpv7pbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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