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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31a535ba0d65cdf6d7a5c8c878d48dd089e73846b50ab03f08c28fd441177f5' 
  AND token = '5ELOVo2+lYELKpo1x4Alss5b/eYtbCbBEIyWdV6f6fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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