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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cc38dd117cd323097a81d9ba17a9b2bcd9ab013aabf24b6a186eaaa6c731d7' 
  AND token = 'RUb0CW4CwFWZWDNVTv9/gp14iKdRRrPYLPjTBlO++C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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