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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228875947b0f41dff11c03678f981d6af56f6f071d1d15214104eff5c0424396' 
  AND token = '4eprIjcHdVQhz2wGFuLab2Tk7RDua/yYbdgd77QXeiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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