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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a52150edffff08ed8c5b012bfaffc50c483117b6c54cf949fe4df8b5a83842e' 
  AND token = 'gknKTEhNpQdn8/2O78HUO5fcSf5x94hbYsTAOPCb/xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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