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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bbc50e1d20888209838affe0a8b5a6ce9d3939a76878c6cd1947f15ee50886' 
  AND token = 'a5beNHBXdEJsLWhT/ESmIXwsmVSLsq1CowH+NjCk8j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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