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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ba2e74a0ebc6b3011243b9735a6237b8b35d221505a7f22c4aab5393987630' 
  AND token = 'OSe308u73VKLXU3EwepXXdEzMmzkjeT6vdFjoAXxUN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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