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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9a6049519a199c0af16d3ce2c3461c0b5e3716613114088de566bec424e291' 
  AND token = 'J/kUrqyq3kLk98KXyD6SAmULF/nD6w+XOOzojOz//HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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