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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbc5b9f0b4a66f05d3d065fb05e0104b1152be85501a7248e720ac508f6175' 
  AND token = '97Jz96Q6vsdA20saWSyNsiW776Ox8dC9Poexzh/xtTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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