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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58751eddb20ae737e594f03a21be721fb42cc2e45073caaff871488f71b7652c' 
  AND token = 'VsIetzBTYyfIJOBUudTKjvWZglrI2PQS+eKWY60rceo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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