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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad20c9f82cdb213998fac310311d1c6650979e10c4c25073a2637a7f89f2132b' 
  AND token = 'fSSR49DfjfWq4FN+u0eLIaJKptJJImHWiWlOxe+5WlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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