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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769c683ba96bdfe7649e7a1a428adec751f093379d4a81a1932317f6451e34da' 
  AND token = '9JxzgUrWlVw3nybOWtInOa80w4TC3HAI861zL6tH2Cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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