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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c9ca34f114ae57f3f82a678ac4dc45e9bafa77e036cd6ee71edfee58c2ece9c' 
  AND token = '6l+Qi8g8C7TTSWXW8oHQSEdIptWlQcxw+wV9bC+dwhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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