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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b6125b86a1debaafbea2273b52ee154a3e918fcdd92fe4fb4b7d6042f59e82' 
  AND token = '1H6FOGkQHN5oo3KL5+p1Kq9D8YhfvSY/1R/T+/6qCs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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