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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c15e04b58740c23bf57f0017278f40029782e4abac73a41bab77d2a65f1e9f3' 
  AND token = 'dbL8VHTAKnemH2TV+BvrIV+l8amyUXr0WiB8XTTDxoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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