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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f98ed6ad64a7417bc4261d5ddeff90ca05b6987ed7f9d85126d7cf21205be7' 
  AND token = 'min8InjrH6JS4lEIUATHbBHA/ohcC1szGMyBw25vF3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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