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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a971f5961adc5b5c0d21c6cf338ee4e9908171fd45a22a108f2ba2190453ac9' 
  AND token = 'RSr+wZwYzVdCEN5jC4HkuGCK4eit+usTucT/ndZbZ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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