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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519bb2f1602ce1d3515f5edffced3e2c9855c275f08ab3b2a53fb771ea1112e6' 
  AND token = '+IYM8pkqMMIwQh/VcMqNkb425svo6KWEeFoUCere8kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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