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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cf085add29f09a61a65b88c7b957777c22278b0c9f81e64bc03d3608232d2f' 
  AND token = 'xuRWchpanHig7kjxIklnFSEijzh+pDdd5YaTaTr5erA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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