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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ee3d4aa3d61f33caa53210953b33a623a1642fc255ae5b43077c78002fa24a' 
  AND token = '1BUj+JnS787HIb3qnbJ+NWMFPrZQ7pX3YetMyS3Ac00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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