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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e9cbb71a9bc3ce3e763387513f7ba724e3579388132ad2c28e65c1afaaf794' 
  AND token = '8wBSz49vIcv64sBBUF/ubD34sS9l6JAzeNskhGamfAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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