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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae39e711f92819dd2bed94e53c42a5ed51613687e9d5e430bdd44d5a53de93e' 
  AND token = 'KgfGFj6Wgq1beY1G/oRwe2Mw62/002LFb2poyGjdPZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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