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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd8b2d33d321b0f14f7bceb581d06ab7d64829fbd1c8f9bb2fc201913b81924' 
  AND token = 'PwWBk2nt3fdE1hQQl6B5bPSKsB1cJY82U6weKOf3mSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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