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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602b8d6af4d5e8d60d1a6dae058f33fe1833d648339f3a26036cb9c728e1292b' 
  AND token = '2kaRqZKEm6uhu659E47jwA+3vA1XKWNo6cCijN/57JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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