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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5cbe522d7e379f6c93e57dd333e1d9dcc1f73b250b3b0c72df621185e6210d3' 
  AND token = 'O5DjgIA4rsMupEiUid/AIb/MBsuifhTwgJvPlGMZOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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