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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb30bd2ae25ec32f702e2be55a585216365671d20d6c49ad3ed17fc9276887f' 
  AND token = '5Yfly4LFCNuVSRU27ZxBfgsWioFt0A/iq1WSRa2h9DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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