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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b11a0837fc070ed8cc82ad23e9375961ba53228a3edfb770852d5c0ff2a718' 
  AND token = '82RF2QWfIXQacDGdKQurzdfz1ze01IftzHZlO+3ohEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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