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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef2b39e86ae6a701c23524f79b9265ef82412a3a0f66ac95146245401b326d2' 
  AND token = 'xkBINe8a5FSyza+qGx7FAt/6tucAkNUqcWWfRAafaqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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