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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca39aabc3adab5be0e37cb478cd1c94342a66788a12dfc33da4ea69718f01f0' 
  AND token = 'v8VzJcxTNyrUqt8z73OtI/ZHx6szM0F+RvTJ5Yb60DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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