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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f45b526ea87bf4a8937eb9f060a14921531e065fd13a509be7a28f3a4b030f2e' 
  AND token = 'T+0zTcBZsl9JrklPKe0spf5Sa0z5nTcuvPPek5yswpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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