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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c3934c2d81665293cd02bf7c5648bcc4e59213e6584b9fb25734544c388ba2' 
  AND token = '74hYXId6WB6tvne7Gv2i0LxQ7t1iGx6xj2tvtcuNBHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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