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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f3f19d18d05bd098005d8011297b18b6e4277a04263db7d3f208f6833512c3' 
  AND token = 'LOjBJs0WRiwF+4+NzlaR6E2x+DoIbmCxFuKj6FEvc54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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